PLUG IN THE WHITE PLUGS ON THE SWITCH INTO THE PC BOARD AND THE DRIVE MOTOR PLUG

PLUG IN THE RED AND BLACK WIRES INTO THE EMPTY 2 PINS ON THE 4 PIN TRIGGER RECEPTACLE

IF THE SPOOLGUN RUNS BACKWARDS REVERSE THE RED AND BLACK WIRES ON THE SWITCH( NOT THE 4 PIN RECEPTACLE)

THIS IS NOT A MILLER SWITCH

(You can hook up the spoolgun and a miller style 300409 switch kit . If your Serial# is LC175022 and above ( with the 2 pin square drive motor plugs)the switch plugs into the harness . If it is a lower serial number , you have to do some wiring , but not hard to do)